The Space Age ______ in October 1957 when the first artificial satellite was launched by the Soviet Union.

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问题 The Space Age ______ in October 1957 when the first artificial satellite was launched by the Soviet Union.

选项 A、initiated
B、originated
C、embarked
D、commenced

答案D

解析 commence开始,着手。initiate着手,发起。or4ginate起源于;开创。embark乘船,装载;从事。
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